fceux/mappers/mmc2and4.cpp

122 lines
2.7 KiB
C++

/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2002 Xodnizel
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "mapinc.h"
#define MMC4reg mapbyte1
#define latcha1 mapbyte2[0]
#define latcha2 mapbyte2[1]
static void FP_FASTAPASS(1) latchcheck(uint32 VAddr)
{
uint8 l,h;
h=VAddr>>8;
if(h>=0x20 || ((h&0xF)!=0xF))
return;
l=VAddr&0xF0;
if(h<0x10)
{
if(l==0xD0)
{
VROM_BANK4(0x0000,MMC4reg[0]);
latcha1=0xFD;
}
else if(l==0xE0)
{
VROM_BANK4(0x0000,MMC4reg[1]);
latcha1=0xFE;
}
}
else
{
if(l==0xD0)
{
VROM_BANK4(0x1000,MMC4reg[2]);
latcha2=0xFD;
}
else if(l==0xE0)
{
VROM_BANK4(0x1000,MMC4reg[3]);
latcha2=0xFE;
}
}
}
DECLFW(Mapper9_write) // $Axxx
{
ROM_BANK8(0x8000,V);
}
DECLFW(Mapper10_write)
{
ROM_BANK16(0x8000,V);
}
DECLFW(Mapper9and10_write)
{
switch(A&0xF000)
{
case 0xB000:
if(latcha1==0xFD) { VROM_BANK4(0x0000,V);}
MMC4reg[0]=V;
break;
case 0xC000:
if(latcha1==0xFE) {VROM_BANK4(0x0000,V);}
MMC4reg[1]=V;
break;
case 0xD000:
if(latcha2==0xFD) {VROM_BANK4(0x1000,V);}
MMC4reg[2]=V;
break;
case 0xE000:
if(latcha2==0xFE) {VROM_BANK4(0x1000,V);}
MMC4reg[3]=V;
break;
case 0xF000:
MIRROR_SET(V&1);
break;
}
}
void Mapper9_init(void)
{
latcha1=0xFE;
latcha2=0xFE;
ROM_BANK8(0xA000,~2);
ROM_BANK8(0x8000,0);
SetWriteHandler(0xA000,0xAFFF,Mapper9_write);
SetWriteHandler(0xB000,0xFFFF,Mapper9and10_write);
PPU_hook=latchcheck;
}
void Mapper10_init(void)
{
latcha1=latcha2=0xFE;
SetWriteHandler(0xA000,0xAFFF,Mapper10_write);
SetWriteHandler(0xB000,0xFFFF,Mapper9and10_write);
PPU_hook=latchcheck;
}